Flexible turning connector buttress structure of large-diameter pressure pipeline

Abstract

The utility model relates to a large-diameter pressure pipeline flexible turning connector buttress structure which comprises a bent pipe, a flexible turning connector buttress and a flexible turning connector buttress. The concrete buttress wraps the elbow pipe in the circumferential direction of the elbow pipe, the concrete buttress extends to the two sides from the bottom in the circumferential direction in the circumferential direction of the elbow pipe, the concrete buttress covers the outwards-protruding side of the elbow pipe, and the concrete buttress extends to the two ends from the bent position of the elbow pipe in the length direction of the elbow pipe; and the multiple outer supporting piles are arranged on the outer protruding side of the bent pipe and connected with the concrete buttress, the outer supporting piles are vertically arranged and inserted into the soil layer, and the multiple outer supporting piles are distributed in the length direction of the bent pipe. The bent pipe is supported on the outwards-protruding side of the bent pipe through the concrete buttress and the outer supporting pile, the pressure generated by water flow turning in the bent pipe on the bent pipe is resisted, the safety of a pressure pipeline at the turning position is guaranteed, the outer supporting pile shares stress, the size of the concrete buttress can be designed to be small, and the supporting effect is good. Therefore, the concrete consumption is reduced, the occupation of surrounding space is reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline construction, in particular to a flexible turning interface buttress structure of a large-diameter pressure pipeline. Background Art

[0002] With the continuous development of engineering construction, there are more and more water supply or sewage pressure pipes with larger and larger diameters. Ductile iron pipes are commonly used. They have the advantages of high strength, strong corrosion resistance, and high water supply pressure. They have been widely used in municipal engineering. Ductile iron pipes generally use a slide-in flexible interface, which cannot transmit tension; but at the turning point of the vertical or horizontal turning of the pressure pipe, due to the change in the direction of the water flow, the water pressure in the pipe will generate thrust, which will cause the pipe structure at the turning point to have a tendency to pull off. In order to ensure the safe operation of the pipeline, piers need to be set at the turning point to balance the force on the pipeline. At present, the design of piers generally refers to the national standard atlas "Flexible Interface Water Supply Pier". The pier design principle of this atlas is mainly to use the deadweight of the concrete pier, the friction between the bottom of the pier and the soil, and the passive earth pressure of the pier to balance the water pressure and active earth pressure.

[0003] For pipelines with high water pressure and large turning angles, the pier design is bulky, the pier cost is high, and it occupies a large underground space of surrounding roads and pipelines. Therefore, how to reduce the project cost and reduce the occupation of surrounding space while ensuring the safety of the pressure pipeline at the turning point is a technical problem that needs to be solved. Utility Model Content

[0004] Based on the above description, the utility model provides a flexible turning interface pier structure for a large-diameter pressure pipeline to solve the problem of how to reduce the project cost and reduce the occupation of surrounding space while ensuring the safety of the pressure pipeline at the turning point.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The present application provides a flexible turning interface pier structure for a large-diameter pressure pipeline, and the technical solution adopted is as follows:

[0007] A flexible turning interface buttress structure for a large-diameter pressure pipeline, comprising:

[0008] Bend pipe, the projection of which on the horizontal plane is V-shaped;

[0009] A concrete buttress, which is wrapped around the curved pipe along the circumference of the curved pipe, the concrete buttress extends from the bottom to both sides along the circumference of the curved pipe, and the concrete buttress covers the protruding side of the curved pipe, and the concrete buttress extends from the bending part of the curved pipe to both ends along the length direction of the curved pipe;

[0010] A plurality of external support piles are arranged on the outer protruding side of the curved pipe and connected to the concrete pier. The external support piles are vertically arranged and inserted into the soil layer. The plurality of external support piles are distributed along the length direction of the curved pipe.

[0011] Preferably, the thickness of the concrete pier at the protruding side of the curved pipe is greater than the thickness at the concave side of the curved pipe.

[0012] Preferably, the thickness of the concrete pier at the bottom of the curved pipe is smaller than the thickness at the protruding side of the curved pipe.

[0013] Preferably, the concrete pier completely covers the bent pipe in the circumferential direction of the bent pipe.

[0014] Preferably, it also includes a plurality of inner support piles, which are located on the inner concave side of the curved pipe and connected to the concrete pier, and the inner support piles are vertically arranged and inserted into the soil layer, and the plurality of inner support piles are distributed along the length direction of the curved pipe.

[0015] Preferably, it further comprises two crown beams, one of which is disposed on the top of the plurality of outer support piles and connects the plurality of outer support piles, and the other of which is disposed on the top of the plurality of inner support piles and connects the plurality of inner support piles, and the crown beams are connected to the concrete piers.

[0016] Preferably, the external support piles are jet-jet piles.

[0017] Preferably, the external support piles are cast-in-place piles.

[0018] Preferably, the bent pipe is a steel pipe.

[0019] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0020] 1. The present application provides a method in which a concrete pier is arranged to wrap around the outside of the bent pipe along the circumferential direction of the bent pipe, and the concrete pier extends from the bottom of the bent pipe to both sides along the circumferential direction. The concrete pier can support the bent pipe at the bottom of the bent pipe. At the same time, the concrete pier extends from the protruding side of the bent pipe to the top of the bent pipe. The concrete pier can support the bent pipe on the protruding side of the bent pipe, thereby resisting the thrust of the water pressure in the bent pipe on the bent pipe, and further supports the bent pipe from the outside by arranging external support piles. On the one hand, the external support piles reinforce the soil layer on the compression side of the concrete pier, thereby improving the supporting strength of the soil layer to the concrete pier. On the other hand, the external support piles share the force, and the volume of the concrete pier can be designed to be smaller, thereby reducing the amount of concrete and the occupation of the surrounding space, reducing the project cost, and stably supporting the bent pipe to ensure the safety of the pressure pipeline at the bend. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a flexible turning interface buttress structure of a large-diameter pressure pipeline provided by an embodiment of the utility model when the curved pipe only turns in the horizontal direction;

[0022] Figure 2 A cross-sectional view of a flexible turning interface buttress structure of a large-diameter pressure pipeline provided by an embodiment of the utility model when the curved pipe is turned only in the horizontal direction;

[0023] Figure 3 A schematic diagram of a flexible turning interface buttress structure of a large-diameter pressure pipeline provided by an embodiment of the utility model when the curved pipe turns in both the horizontal and vertical directions;

[0024] Figure 4 A schematic diagram of another perspective of the flexible turning interface buttress structure of a large-diameter pressure pipeline provided by an embodiment of the utility model when the curved pipe turns in both the horizontal and vertical directions at the same time;

[0025] Figure 5 A cross-sectional view of a flexible turning interface pier structure for a large-diameter pressure pipeline provided in an embodiment of the utility model when the curved pipe turns in both the horizontal and vertical directions.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Bend pipe; 2. Concrete pier; 3. External support piles; 4. Internal support piles; 5. Crown beam; 6. Ductile iron pipe straight section; 7. Conversion flange. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0031] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0032] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0033] Reference Figure 1-5 As shown, an embodiment of the present application provides a flexible turning interface pier structure for a large-diameter pressure pipeline, which includes a bend 1 and a concrete pier 2, wherein the bend 1 is made of a steel pipe, and when the pipeline system is installed, both ends of the bend 1 are respectively connected to the ductile iron pipe straight pipe section 6 of the pipeline system through a conversion flange 7.

[0034] Reference Figure 1-5 As shown, the projection of the curved pipe 1 on the horizontal plane is V-shaped, and the concrete pier 2 is wrapped around the curved pipe 1 along the circumference of the curved pipe 1. The concrete pier 2 extends from the bottom to both sides along the circumference of the curved pipe 1, and the concrete pier 2 covers the protruding side of the curved pipe 1. The concrete pier 2 extends from the bending part of the curved pipe 1 to both ends along the length direction of the curved pipe 1, and a plurality of external support piles 3 are provided in the soil layer on the protruding side of the curved pipe 1, and the external support piles 3 are connected to the concrete pier 2, and the external support piles 3 are vertically arranged and inserted into the soil layer, and the plurality of external support piles 3 are distributed along the length direction of the curved pipe 1.

[0035] Through the above-mentioned arrangement, the concrete pier 2 can support the curved pipe 1 at the protruding side of the curved pipe 1, thereby resisting the thrust of the curved pipe 1 caused by the water pressure in the curved pipe 1, and further support the curved pipe 1 from the outside by setting the external support piles 3. On the one hand, the external support piles 3 reinforce the soil layer on the compression side of the concrete pier 2, thereby improving the supporting strength of the soil layer to the concrete pier 2. On the other hand, the external support piles 3 share the force, and the volume of the concrete pier 2 can be designed to be smaller, thereby reducing the amount of concrete and reducing the occupation of the surrounding space, reducing the project cost, and can stably support the curved pipe 1 to ensure the safety of the pressure pipeline at the bend.

[0036] Specifically, in this embodiment, the curved pipe 1 is formed by connecting two straight pipe sections and a connecting end, the angle between the two straight pipe sections is an obtuse angle, and one of the straight pipe sections is horizontal. In order to make the projection of the curved pipe 1 on the horizontal plane V-shaped, the curved pipe 1 can turn only in the horizontal direction, or in both the horizontal and vertical directions at the same time.

[0037] Reference Figure 1-2 As shown, for the case where the curved pipe 1 only turns in the horizontal direction, the concrete pier 2 extends from the bottom to both sides in the circumference of the curved pipe 1. The concrete pier 2 extends to the middle of the curved pipe 1 on the concave side of the curved pipe 1, and extends to near the top of the curved pipe 1 on the protruding side of the curved pipe 1, thereby completely covering the protruding side of the curved pipe 1. In this way, the curved pipe 1 can be supported by the concrete pier 2 on the protruding side of the curved pipe 1, and the pressure on the protruding side of the curved pipe 1 caused by the water pressure in the curved pipe 1 is borne, thereby preventing the curved pipe 1 from being separated from the pipeline system. According to the force of the curved pipe 1, when designing the thickness of the concrete pier 2, the thickness of the concrete pier 2 at the protruding side of the curved pipe 1 is greater than the thickness at the concave side of the curved pipe 1, and the thickness of the concrete pier 2 at the bottom of the curved pipe 1 is less than the thickness at the protruding side of the curved pipe 1. The specific thickness parameters are designed according to the actual situation and can be adjusted according to the surrounding conditions. When setting the external support piles 3, the external support piles 3 are jet-jet piles. The top of the external support piles 3 is higher than the concrete pier 2 and the bottom is deep into the soil layer. It is ensured to have a sufficient effective length to improve the strength of the external support piles 3. The jet-jet piles play a role in reinforcing the soil layer on the compression side, improving the supporting strength of the soil layer on the concrete pier 2, and ensuring the supporting stability of the pipeline and the concrete pier 2. In the case that the curved pipe 1 only turns in the horizontal direction, two rows of external support piles 3 can be set to further improve the supporting effect. The pier structure has the following advantages:

[0038] 1. Use a length of steel elbow 1 to replace the traditional ductile iron pipe elbow to improve the safety and integrity of the turning point.

[0039] 2. The concrete pier 2 partially covers the elbow 1, which is beneficial to the later inspection and maintenance of the pipeline.

[0040] 3. Replacing the traditional treatment method (retaining the steel sheet piles of the supporting structure or pouring concrete in the gap area) with rotary jetting piles can reduce the impact on the underground space area of ​​​​the urban road.

[0041] 4. It reduces the total amount of concrete used and at the same time reduces the underground pipeline space occupied in local areas, which has good economic benefits and practical value.

[0042] The construction process of the pier structure when the curved pipe 1 only turns in the horizontal direction is as follows:

[0043] 1. The existing road is excavated with steel sheet pile support, and the reserved spacing between the steel sheet pile and the pipeline can be the width of the pier.

[0044] 2. Tie up the steel bars and pour the concrete pier 2 at the bottom of the pipeline. Use cardboard to isolate the concrete side from the steel sheet pile.

[0045] 3. Place a new section of steel elbow pipe.

[0046] 4. Pour the remaining reinforced concrete piers 2, and remove the steel sheet piles on both sides after reaching the required strength.

[0047] 5. Two rows of jet jet piles are installed on the protruding stress side of the bend 1. The two rows of piles are staggered to ensure that the passive earth pressure of the surrounding soil can be effectively utilized.

[0048] 6. Finally, the steel elbow 1 is connected to the ductile iron pipe straight section 6 through a flange.

[0049] 7. Backfill and cover with soil, and conduct water pressure test on the pressure pipe. If qualified, the upper existing road surface will be restored to its original state.

[0050] Reference Figure 3-5 As shown, for the case where the curved pipe 1 turns in both horizontal and vertical directions, that is, one straight pipe section of the curved pipe 1 is horizontal and the other straight pipe section extends downward, at this time, the water pressure in the curved pipe 1 generates a horizontal outward force and a vertical upward force on the curved pipe 1. At this time, the concrete pier 2 is set to completely cover the curved pipe 1 in the circumferential direction of the curved pipe 1, and the concrete pier 2 can bear the horizontal and vertical forces of the curved pipe 1.

[0051] Reference Figure 3-5As shown, specifically, in order to improve the support strength of the curved pipe 1, a plurality of inner support piles 4 are also provided on the inner concave side of the curved pipe 1, the inner support piles 4 are connected to the concrete pier 2, the inner support piles 4 are vertically arranged and inserted into the soil layer, and the plurality of inner support piles 4 are distributed along the length direction of the curved pipe 1. Through this arrangement, the inner support piles 4 and the outer support piles 3 cooperate to effectively support the curved pipe 1 and the concrete pier 2 from both sides of the curved pipe 1, and meet the support requirements of the curved pipe 1 under complex stress conditions. When setting the inner support piles 4 and the outer support piles 3, cast-in-place piles are used, and the bottoms are all deep into the soil layer. The number and specific parameters of the outer support piles 3 and the inner support piles 4 are designed according to the actual situation. The outer support piles 3 and the inner support piles 4 of the cast-in-place piles play a supporting role for the concrete pier 2, improve the support strength of the concrete pier 2 and the pipeline, and the cast-in-place piles can be used as a supporting structure when the soil layer is excavated during construction, without the need for additional support structure installation and removal construction, reducing the amount of work and reducing construction costs.

[0052] Reference Figure 3-5 As shown, further, a crown beam 5 is respectively arranged on the top of the outer support pile 3 and the inner support pile 4, the crown beam 5 on the top of the outer support pile 3 connects multiple outer support piles 3, and the crown beam 5 on the top of the inner support pile 4 connects multiple inner support piles 4, and both crown beams 5 are connected to the concrete pier 2. When designing the concrete pier 2, its thickness at the inner concave side and the outer protruding side of the curved pipe 1 is the same, and both are greater than the thickness at the bottom of the curved pipe 1, and the top of the concrete pier 2 is set to be flush with the crown beam 5.

[0053] The construction process of the pier structure when the curved pipe 1 turns in both the horizontal and vertical directions is as follows:

[0054] 1. The existing road is excavated with cast-in-place pile support.

[0055] 2. Cast the top beam 5 of the bored pile and reserve steel bars for connection with the reinforced concrete pier 2.

[0056] 3. Tie the steel bars and pour the concrete pier 2 at the bottom of the curved pipe 1.

[0057] 4. Place a new section of steel elbow pipe 1 and cast the remaining reinforced concrete piers 2.

[0058] 5. The steel elbow 1 is connected to the ductile iron pipe straight section 6 through a flange.

[0059] 6. Backfill and cover with soil, and conduct water pressure test on the pressure pipe. If qualified, the upper existing road surface will be restored to its original state.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible turning joint buttress structure for a large diameter pressure pipeline, characterized in that: include: The curved pipe (1) has a V-shape when projected on a horizontal plane; A concrete buttress (2) is wrapped around the curved pipe (1) along the circumference of the curved pipe (1); the concrete buttress (2) extends from the bottom to both sides along the circumference of the curved pipe (1); the concrete buttress (2) covers the protruding side of the curved pipe (1); the concrete buttress (2) extends from the bending point of the curved pipe (1) to both ends along the length direction of the curved pipe (1); A plurality of external support piles (3) are arranged on the outer protruding side of the curved pipe (1) and connected to the concrete pier (2); the external support piles (3) are arranged vertically and inserted into the soil layer; and the plurality of external support piles (3) are distributed along the length direction of the curved pipe (1).

2. The large diameter pressure pipeline flexible turning interface buttress structure according to claim 1 is characterized by: The thickness of the concrete pier (2) at the protruding side of the curved pipe (1) is greater than the thickness at the concave side of the curved pipe (1).

3. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 1 is characterized by: The thickness of the concrete pier (2) at the bottom of the curved pipe (1) is smaller than the thickness at the protruding side of the curved pipe (1).

4. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 1 is characterized by: The concrete pier (2) completely covers the curved pipe (1) in the circumferential direction of the curved pipe (1).

5. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 4 is characterized in that: It also includes a plurality of inner support piles (4), wherein the inner support piles (4) are located on the inner concave side of the curved pipe (1) and connected to the concrete pier (2), the inner support piles (4) are vertically arranged and inserted into the soil layer, and the plurality of inner support piles (4) are distributed along the length direction of the curved pipe (1).

6. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 5 is characterized by: It also comprises two crown beams (5), one of the crown beams (5) being arranged on the top of the plurality of outer support piles (3) and connecting the plurality of outer support piles (3), and the other of the crown beams (5) being arranged on the top of the plurality of inner support piles (4) and connecting the plurality of inner support piles (4), and the crown beams (5) are connected to the concrete pier (2).

7. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 1 is characterized by: The external support piles (3) are jet-jet piles.

8. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 1 is characterized by: The external support piles (3) are cast-in-place piles.

9. The large diameter pressure pipeline flexible turning joint buttress structure according to claim 1 is characterized by: The bent pipe (1) is a steel pipe.

Images